SE447528B - PROCEDURE FOR GENERATING A MONITOR IMAGE - Google Patents

Description

This object is achieved in that the method according to the invention has obtained the features stated in claim 1. Appropriate further developments of the invention appear from the subclaims.

The invention will be described in more detail in the following with reference to the figures in the accompanying drawings, where Fig. 1 shows a block diagram of a device for realizing the method according to the invention, Fig. 2 shows an image capture and image reproduction device with correction possibility , and Fig. 3 shows a flow chart for illustrating the single image correction.

Fig. 1 shows four image memories B1-Bm, in which, for example, the single images EBI-EBVIII according to Fig. 2 are stored. The single images in the image memories B1-Bm are retrieved via a charging device LA and a computer R1 from a mass memory MSF. The mass memory MSP can in this case consist of an arbitrary memory medium, such as, for example, a magnetic tape memory or disk memory. The information in the digital image memories B1-Bm is arranged so that when generating matched beat signals by means of a beat generator TG and when matched control of these image memories on the output information corresponding to a video signal, but in digital form, can be extracted. The B1-Bm outputs of the image memories are optionally directly or via delay elements VZ1-VZm connected to digital switches ES1-ESn.

Via the digital switches ES1-ESn, a switching between the single images EBI-EBVIII can be effected, so that on the outputs of the digital switches ES1 ~ ESn digital signals for image information are removable. The digital switches ES1-ESn are controlled in this case by address sensors AS1- -ASn are also fed with the central clock signal from the clock generator AG1-AGn via addressing circuits AS1-ASn. Addressing circuits TG. The digital-to-analog converters DA1-DA connected to the ES1-ESn switches convert the digital signals into a corresponding analog signal, which affects post-connected conventional monitors M1-Mn, so that in correspondence with the addressing of single images a subset of the large image is presented on the monitor in question.

Fig. 2 shows that a single camera K1 is sufficient to sequentially record the single images EBI-EBVIII and, after appropriate signal conversion in an analog-to-digital converter W1 via an image memory BS and a computer RE, store them in the mass memory. MSP. It should be noted that when capturing an image with a camera, various errors can occur, which depend on the camera's construction, including its optics. The most significant errors are caused by geometric distortions and changes in gray value. In the present method, in certain cases, the image content is calculable or changeable by means of computer methods, so that it is possible to compensate for the above-mentioned errors by means of computers. This will be elucidated in the following in connection with Figs. 2 and 3.

The single image EB recorded via the camera K1 and digitized by means of the converter W1 is stored in the digital image memory BS and can be read into the mass memory MSP via the computer R1. Via the computer R1, there is also the possibility of re-reading the information stored in the nasal memory MSP and retransmitting it to the image memory BS. From there, the image stored in the image memory BS can be converted into a video signal by means of the digital-to-analog converter DA1, provided with adapted clock signals and presented on the monitor M1. The device shown further offers an opportunity for processing and improving the image content of the single images EBI-EBVIII. For this purpose, a reference single image EBREF is recorded with the camera K1, which image is digitized by means of the converter W1 and is also stored in the mass memory MSP.

With respect to geometry corrections, the reference single image EBREF is preferably a raster image, the mathematical description of which can be entered into the computer in the form of a program. The single images EBI-EBVIII are after their digitization also in the mass memory MSP. The computer R1 then determines the EBREF deviations of the reference single image from the mathematical description of the raster. By means of the deviation of the EBREF image content of the digitized reference single image from the ideal raster of the mathematical description, the computer R1 determines the geometry error of the individual pixels of the camera. Once the computer R1 has determined these deviations, it can use them to change the digitized single images EBI-EBVIII in such a way that the geometry errors caused by the camera are corrected. 'The same method can in principle be used to correct gray value errors. In this case, only the setpoint gray value for each pixel must be pre-entered in the computer R1. The difference between the setpoint gray value and the actual gray value of the reference single image is used to correct the gray values of the individual pixels' EBI-EBVIII different pixels. In this way, the computer R1 corrects the various single images EBI-EBVIII in order and then stores them again in the mass memory.

In the event that all single images are corrected, the computer can transfer the corrected images to the digital image memories B1-Bm (Fig. 1). A corrected large image for presentation of subsections is then available in the image memories B1-Bm.

The method according to the invention described above has the advantage that the image information is digitally processable and correctable. In addition, there is, for example, the possibility of inserting silhouettes of certain objects in the image content, whereby, in contrast to an optical overlay, no mixing of objects and background image information takes place.

Claims (3)

447,528 Patent claims A method for generating a monitor image, which as a subsection of a large image is recorded by means of a TV camera and divided into matched single images, wherein for generating an arbitrary subsection of the large image on a monitor with fast arbitrary multiple access, the single images are selectively addressable in pixels, where the image information of each single image is delayed for bridging the line return time corresponding to the length of this time, and where after traversing the same line of all single images in the line direction, a jump is performed to a higher order than the next line. - the distance corresponds to at least the number of single images in the line direction, characterized in that the single images (EBI-EBVIII) are recorded in series by means of a single camera (KI), digitized in a manner known per se and 1agra5 1 a digital image memory (Bl-Bm ), wherein a physically separate memory area is assigned to each single image, and that for generating the sub-section on mon itorn (M1 ~ Mn), the stored digital image information in the memory areas belonging to the sub-section (B1-Bm) is read out selectively and after partial delay together with analog-to-digital conversion is added to the monitor for presentation. Method according to Claim 1, characterized in that the single image stored in the image memory (B1-Bm] (EBI-EBVIII) is corrected by means of a correction program in a computer connected to the image memory (R1). Method according to claim 2, characterized in that a reference single image (EBref) is recorded by the TV camera (K1) by a comparison of the reference single image with a mathematically predetermined mathematical description of the reference single image in the computer (RT), and by that then the image content of the image memory (B1-Bm) is improved on the basis of the correction signals obtained in the comparison.